package main

import "fmt"
// import "unsafe"

func main() {

	// var num int8 = 100
	// fmt.Printf("num = %v, num的类型是%T\n", num, num)
	// fmt.Println(unsafe.Sizeof(num))

	var a1 int32 = 10
	var a2 int64 = 21
	fmt.Println(a1 + a2)

}